<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>包含选择器</title>
		<style type="text/css">
			p{color: blue;}
			p a{color: red;}
			a{color: blueviolet;}
		</style>
	</head>
	<body>
		<p>段落标记<a>包含的a标记修饰成红色</a></p>
		<a>段落标记外的a标记</a>
	</body>
</html>
